Daihatsu Sirion (1999) Wheel Fitment
Daihatsu Sirion (1999): 4x100 bolt pattern, 54.1mm center bore. Factory wheels: 14x5.0J F/R. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 14x5.0J F/R |
| Flush Fitment | 15x6.0J at ET32 offset |
| Maximum Aggressive | 16x6.5J at ET30 offset |
How to Read Wheel Offset & Measurements
Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.
ANKUSI Engineering Expert Advice
On a compact performance platform, every pound of rotational mass fights the car's natural agility. A forged wheel keeps strength at the factory-rated level while cutting that rotational weight, which is where the driving-feel improvement actually comes from.
The Daihatsu Sirion runs a 4x100 bolt pattern, 54.1mm center bore, and a 14x5.0J, front and rear, wheel from the factory. Our Flush Fitment reference is 15x6.0J ET32, which tucks the tire under the fender lip on a stock-height Daihatsu Sirion. Our Maximum Aggressive reference is 16x6.5J ET30 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Daihatsu Sirion OE Wheel Specs
The 1999 Daihatsu Sirion (Hatchback) uses a 4x100 bolt pattern with a 54.1mm center bore. Factory wheels are 14x5.0J F/R.
Why the factory spec works for most owners:
- Keeps the factory ride quality and noise levels intact
- A common fitment for this class, so replacement tires are easy to source
- Preserves clearance around the OE brakes and suspension geometry
- Delivers predictable, easy-to-live-with handling for daily use
Flush Fitment
For a flush look with minimal rubbing, F/R 15x6.0J ET32 is the recommended starting point on a stock or mildly lowered Daihatsu Sirion.
Maximum Aggressive Fitment
F/R 16x6.5J ET30 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
5-Tier Configuration Options
A Factory-Style 14x5.0J ET38
Recommended setup: 14x5.0J ET38 | Economy impact: Negligible | Best for: Daily commuting, family use
Appearance: 7/10 | Comfort: 9.5/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $450-800 (wheels + tires + install)
B Comfortable Upgrade 15x5.5J ET35
Recommended setup: 15x5.5J ET35 | Economy impact: -2 to -4% | Best for: Daily / street
Appearance: 8/10 | Comfort: 9/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $1,950-2,550 (wheels + tires + install)
C Balanced / Flush Fit 15x6.0J ET32
Recommended setup: 15x6.0J ET32 | Economy impact: -4 to -6% | Best for: Street
Appearance: 8.5/10 | Comfort: 8/10 | Install difficulty: ★★☆☆☆
Estimated cost: $2,600-3,400 (wheels + tires + install)
D Aggressive 16x6.5J ET31
Recommended setup: 16x6.5J ET31 | Economy impact: -6 to -9% | Best for: Show / occasional track
Appearance: 9/10 | Comfort: 6.5/10 | Install difficulty: ★★★☆☆
Estimated cost: $3,900-5,000 (wheels + tires + install)
E Max Aggressive 16x6.5J ET30
Recommended setup: 16x6.5J ET30 | Economy impact: -8 to -12% | Best for: Show only
Appearance: 9.5/10 | Comfort: 4/10 | Install difficulty: ★★★★☆
Estimated cost: $4,800-6,200+ (wheels + tires + install)
Performance Comparison Matrix
| Metric | Tier A | Tier B | Tier C | Tier D | Tier E |
|---|---|---|---|---|---|
| Wheel Spec | 14x5.0J ET38 | 15x5.5J ET35 | 15x6.0J ET32 | 16x6.5J ET31 | 16x6.5J ET30 |
| Economy Impact | Negligible | -2 to -4% | -4 to -6% | -6 to -9% | -8 to -12% |
| Appearance | 7/10 | 8/10 | 8.5/10 | 9/10 | 9.5/10 |
| Comfort | 9.5/10 | 9/10 | 8/10 | 6.5/10 | 4/10 |
| Install Difficulty | ★☆☆☆☆ | ★☆☆☆☆ | ★★☆☆☆ | ★★★☆☆ | ★★★★☆ |
| Cost Range | $450-800 | $1,950-2,550 | $2,600-3,400 | $3,900-5,000 | $4,800-6,200+ |
| Best For | Daily commuting, family use | Daily / street | Street | Show / occasional track | Show only |
Real-World Reference Cases
The examples below are compiled from typical ANKUSI customer configurations and are labeled as reference cases, not individually verified real-world builds.
Case 1: Daily Driver (Factory-Style)
Profile: Everyday driving, prioritizes comfort and low running cost.
Setup: 14x5.0J ET38
Cost: ~$620
Outcome: Minimal visual change, ride and fuel economy essentially unaffected.
Case 2: Balanced Enthusiast (Balanced / Flush Fit)
Profile: Wants a sportier stance without sacrificing daily usability.
Setup: 15x6.0J ET32
Cost: ~$3,000
Outcome: Noticeable visual upgrade, fuel economy drop within the expected range.
Case 3: Show Build (Max Aggressive)
Profile: Built primarily for shows or occasional track/show use.
Setup: 16x6.5J ET30
Cost: ~$5,500
Outcome: Maximum visual impact; daily comfort and fuel economy are heavily compromised, physical test fit required before production.
Decision Guide
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: 14x5.0J ET38 → ~4.5″ backspacing
- Flush: 15x6.0J ET32 → ~4.76″ backspacing
- Max: 16x6.5J ET30 → ~4.93″ backspacing
Want to check a different width or offset before you order? Use our Offset & Backspacing Calculator to solve the numbers yourself, or looking for your exact Daihatsu spec, or want a wheel built to a custom offset for your Daihatsu Sirion? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.